2x la a doua +4x+6>0

 



Răspuns :

delta= b^2-4ac
delta= 16-4*6*2
delta=16-48<0 => 2x^2+4x+6>0 oricare ar fi x apartine R 
[tex] 2x^{2} +4+6>0 2x^{2}>-4-6 2x^{2}>-10 x^{2}>- \frac{10}{2} x^{2}>-5[/tex]